Engine valve gear



May 20, 1924 A. J. LAVOIE ENGINE VALE GEAR Original Filed Dec If'llilINVENTOR bnr-v ff ATTORNEY' Patented May 20, 1924.

UNITED sTATes PATIENT OFFICE.

, ENGINE VALVE GEAR.

Application mea December s, 1920, serial No. 429,484. 'Renewed october1o, 192s.

To all whom it may concern:

Be it known that I, ALPHONSE JOSEPH Lavom, a subject of the King ofGreat Britain, and residing at 294 Wilson Avenue, Notre Dame de Grace.in the city and district of Montreal, in the Province of Quebec, in theDominion of Canada, have invented a new and useful Engine Valve Gear, ofwhich the following is the specification.

The invention relates to engine valve gear as described in the presentspecification and illustrated in the accompanying drawings that formpart of the same.

Thel invention consists essentially of the novel construction andarrangement of parts, whereby the adjustable plunger pin indirectlyconnected to the driver shaft is in constant-and direct contact with thevalve stem.

The objects of the invention are. to operate the valve without noise andwith due regard to vibratory movements; t'o insurel constant andtherefore steady operation; to maintain 'the operating parts in goodworking condition; to obtain valve clearance in a muffled chamber, wherethe hammer blow of' the plunger pin is cushioned'T and generally toprovide a reliable, durable and ellicient valve operating gear.

In the drawings, Figure 1 is an end view partially in vertical section,showing the interior of the cylinder head and a valve and valve gear. 1

Figure 2 is a sectional detail enlarged to show the plunger pin andmounting.

Figure 3 is a perspective detail 'ofthe adjusting screw.

Figure 4 is a perspective detailof the plunger pin.

Figure 5 is a perspective detail of the valve and contiguous parts. v

Figure 6 is a fragmentary view of the cam operatedlever, showingladjusting screw plunger pin and head of valve stem.

Like numerals of reference indicate corresponding` parts in each figure.

Referring to the drawings, the plunger pin 1 is shown as having anannular'shoulder 2. forming a spring stop and a hammer vhead 3continuing from said shoulder and formingva guide for the plunger pin inits reclprocating movements.

The pin 1 is mounted in the adjusting screw and at its inner endprojects' into the recess 5 extending beyond the bottom or ledge 6 inthe hollow of the screw 4, said v 20 of the cam lever 21, the other arm"ledge forming Aa stop for a string'v 10, said screw having the exteriorthread `2' and a driver slot 8.

The screw 4 is locked by the nut 24 and the felt lining 9 is introducedinto the recess 5 and forms a cushion for the pin 1.

The spring 10 presses outwardly on the pin 1 against the spring stop 2and thehammer end 3 engages valve stem 12. The lock washenll engagesthevalve stem 12 in the annular slot 25, as a lock for the spring collar 13which it engages in the central cupped portion 14, said collar havingthe outer flange 15 retaining the spring 16 the latter encircling thevalve'stem 12. The spring 16 is -between the collar 13 and intermediatewall`17 of the head centrally around the valve stem guide 18 above thevalve 19 at the lower end of the stem 12. Thek adjusting screw 4 isscrew-threaded into the arm y 22 being engaged by. the cam 23.

In the operation of this valve gear, the cam 23 is driven in anysuitable way by means of operatively connected parts to the pistondriven members, and thisA constantly and regularly operates the camlever 21. This movement is communicated to the adjusting screw 4 andconsequent-lv to the plunger pin 1.

The hammer end 3 engages the top of the `valve stem 12 slightly offcentre of said hammer end, and as the plunger pin 1 is freely rotatable,any movement to or from the valve stem in respect to the hammer end ofthe said plunger pin is readily accounted i for, as other rthan thedown-ward pressure there is no rigidity during the temporary period oftheir engagement.

Some changes may be made to contribute to lilling the wants due tosurrounding conditions, but all such changes will enjoy the protectionunder the patent asffully set forth in the claims for novelty following.

What I claim is: i.

1. In an engine valve gear. a rocker arm suitablyv operated at intervalsand an adjusting screw at the end thereof having a pin chamber thereinand a cushion bottom to said chamber, a plunger 'pin spring-held to itsouter position and having its head forming a guide in its reciprocatingmove- -ments Within said chamber and a valve suitably operated atintervals and an adjusting screw carried. by said arm and recessed fromthe under side and aireduced bottom to said recess, a felt pad in saidreduced end of the recess, a plunger pin having a head reciprocating insaid screw recess and projectmg therebeyond, an encircling springbetween the shoulder of said pin and that 1n said recess wall, a valvehaving keeper slots 'l s Lacasse in the said stem,` a rspring encirclingsaid lo Y stem, an annular housing for the upper end of said spring` lhaving a central keeper mounted 0n said stem in said slots and with-- insaid housing recess.v

Signed at Montreal, Quebec, Canada, this I5 second day of December,1920.

t ALPHONSE JOSEPH LAVOIE.

